title
description
overview.reverseDNS.title: overview.reverseDNS.content
PTR Names: Generated by reversing IP octets/nibbles and appending the appropriate arpa domain.
overview.zoneFiles.title: overview.zoneFiles.content
examples.title
input.type.label
results.title
1 results.summary.totalPTRs
1 results.summary.ipv4
1 results.summary.zones
results.entries.title
results.entries.ipAddress
results.entries.ptrRecord
Zone File Line
results.entries.type
192.168.1.100100.1.168.192.in-addr.arpa 100 IN PTR host-192-168-1-100.example.com. IPv4
PTR Record Format
PTR records use the special in-addr.arpa (IPv4) and ip6.arpa (IPv6) domains. IP
addresses are reversed: 192.168.1.100 becomes 100.1.168.192.in-addr.arpa.
Zone File Usage
The generated zone file lines can be copied directly into your reverse DNS zone files. Remember to adjust the hostname targets to match your actual domain structure.
IPv6 Nibbles
IPv6 PTR records use individual hex digits (nibbles) reversed. Each character becomes a separate label: 2001:db8::1 becomes a very long ip6.arpa name.
Best Practices
Ensure PTR records have corresponding A/AAAA records for proper forward-reverse DNS consistency. Use descriptive hostnames that include IP information for easier network management.